Wartenberg syndrome also known as cheiralgia paresthetica is due to compression of superficial branch of the radial nerve in the distal forearm. It can be secondary to tight watch band or handcuffs, compression from distal radius fracture or idiopathic.
Patients present with pain and parasthesia along the dorsum of distal forearm ,index finger and thumb. Clinically it mimics De Quervain tenosynovitis but symptoms mostly occur at rest and Tinel test can be also positive.
Loss of normal fibrillary pattern with swelling and increased vascularity on color flow imaging.
- T2: characteristic increase in signal intensity along with swelling of the nerve.